Initial skeletal implementation of the PrincipalService. Also, use the Login()/GetUserBlessing()

examples/echo/echo_server.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "examples/echo/echo.mojom.h"
 #include "mojo/common/binding_set.h"
 #include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/application/application_connection.h"
 #include "mojo/public/cpp/application/application_delegate.h"
+#include "mojo/public/cpp/application/application_impl.h"
 #include "mojo/public/cpp/application/application_runner.h"
 #include "mojo/public/cpp/application/interface_factory.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
+#include "mojo/public/cpp/utility/run_loop.h"
+#include "mojo/services/vanadium/security/public/interfaces/principal.mojom.h"
 
 namespace mojo {
 namespace examples {
 
 // This file demonstrates three ways to implement a simple Mojo server. Because
 // there's no state that's saved per-pipe, all three servers appear to the
 // client to do exactly the same thing.
 //
 // To choose one of the them, update MojoMain() at the end of this file.
 // 1. MultiServer - creates a new object for each connection. Cleans up by using
@@ skipping 18 matching lines @@
 // This simplifies lifetime management. This class is only used by MultiServer.
 class StrongBindingEchoImpl : public EchoImpl {
  public:
   explicit StrongBindingEchoImpl(InterfaceRequest<Echo> handle)
       : strong_binding_(this, handle.Pass()) {}
 
  private:
   mojo::StrongBinding<Echo> strong_binding_;
 };
 
+class GetBlessingResponse {
+ public:
+  void Run(const BlessingPtr& b) const {
+    // EchoClient user identity is available as b.get()->chain
+    RunLoop::current()->Quit();
+  }
+};
+
 // MultiServer creates a new object to handle each message pipe.
 class MultiServer : public mojo::ApplicationDelegate,
                     public mojo::InterfaceFactory<Echo> {
  public:
   MultiServer() {}
 
+  void Initialize(ApplicationImpl* app) override {
+    app->ConnectToService("mojo:go_principal_service", &login_service_);
+  }
+
   // From ApplicationDelegate
   bool ConfigureIncomingConnection(
       mojo::ApplicationConnection* connection) override {
+    AppInstanceNamePtr app(AppInstanceName::New());
+    app->url = connection->GetRemoteApplicationURL();
+    login_service_->GetUserBlessing(app.Pass(), GetBlessingResponse());
     connection->AddService<Echo>(this);
     return true;
   }
 
   // From InterfaceFactory<Echo>
   void Create(mojo::ApplicationConnection* connection,
               mojo::InterfaceRequest<Echo> request) override {
     // This object will be deleted automatically because of the use of
     // StrongBinding<> for the declaration of |strong_binding_|.
     new StrongBindingEchoImpl(request.Pass());
   }
+
+ private:
+  PrincipalServicePtr login_service_;
 };
 
 // SingletonServer uses the same object to handle all message pipes. Useful
 // for stateless operation.
 class SingletonServer : public mojo::ApplicationDelegate,
                         public mojo::InterfaceFactory<Echo> {
  public:
   SingletonServer() {}
 
   // From ApplicationDelegate
@@ skipping 51 matching lines @@
 }  // namespace mojo
 
 MojoResult MojoMain(MojoHandle application_request) {
   // Uncomment one of the three servers at a time to see it work:
   mojo::ApplicationRunner runner(new mojo::examples::MultiServer());
   // mojo::ApplicationRunner runner(new mojo::examples::SingletonServer());
   // mojo::ApplicationRunner runner(new mojo::examples::OneAtATimeServer());
 
   return runner.Run(application_request);
 }